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1. Catalysis and photocatalysis
The International Union of Pure and Applied Chemistry (IUPAC) defines catalysis as a process that increases the rate of a reaction without altering its free enthalpy.
Every catalytic reaction requires the use of a catalyst, a substance that initiates the catalytic process and appears both as a reactant and a product of the reaction, i.e. it is restored at the end of the process, and therefore does not appear in the overall reaction balance. In fact, the catalyst is involved in one (or more) stages of the reaction, which explains its influence on the speed of the reaction, and is then regenerated in a subsequent stage. As a result, the catalyst is used in much smaller quantities than the other reagents. What's more, the catalyst has no influence on the composition of the thermodynamic equilibrium at the end of the reaction....
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The Ultimate Scientific and Technical Reference
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Catalysis and photocatalysis
Bibliography
Standards and norms
- Photocatalysis – Test and analysis method for measuring the efficiency of photocatalytic systems for the removal of volatile organic compounds/odors from recirculated indoor air – Test in confined spaces. - XP B44-013 - AFNOR - Décembre 2009
- Photocatalysis – Test method for evaluating photocatalytic materials for NOx degradation – Single-pass tangential method. - XP B44-011 - AFNOR - Décembre 2009
- Photocatalysis...
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